RPM 35mm Low Rail Cap Diving Board Optic Mount

Every accessory added to a rifle brings a clamp, a rail section and weight along with it. A rail cap sidesteps most of that by using hardware the rifle already carries: the top half of the scope ring becomes the mount, and a short Picatinny rail rides over the tube for a rangefinder or a compact red dot.

This is the 35mm size in the low rail height, black. Fitment is the same across RPM’s line: CLR series rings plus the Bravo and Delta cantilevers. Because the rail sits directly over the scope, the added device stays on the rifle’s centerline instead of hanging out to one side. Set the cap screws evenly and verify the scope has not shifted before you confirm zero.